A method of encoding and decoding computer video signals for transmission over a twisted pair cable is disclosed. Vertical and horizontal sync components of a video signal are converted into narrow vertical and horizontal sync components having the pulse width of 20 nanoseconds. Narrow vertical and horizontal sync components are then combined with red and green components. After transmission via a twisted pair cable, narrow vertical and horizontal sync components are extracted from red and green components and converted back into vertical and horizontal sync components.Even though the red and green components also comprise narrow sync signals, the narrow sync signals will not be detected by the detection circuits and presence of such narrow sync components in the red and green components will not interfere with the quality of the picture displayed on the display device.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of encoding and decoding computer video signals for transmission over a twisted pair cable, comprising the steps of: (a) providing a computer video signal comprising red, green, blue, vertical sync and horizontal sync components; (b) converting the vertical sync component into a narrow vertical sync component; (c) combining the narrow vertical sync component with the red component, thereby generating a combined red narrow vertical sync component; (d) converting the horizontal sync component into a narrow horizontal sync component; (e) combining the narrow horizontal sync component with the green component, thereby generating a combined green narrow horizontal sync component; (f) transmitting the combined red narrow vertical sync, combined green narrow horizontal sync and blue components via a twisted pair cable such that one pair of conductors is used for transmission of each of the components, thereby utilizing only three pairs of conductors; (g) extracting the narrow vertical sync component from the combined red narrow vertical sync component without removing the narrow vertical sync component from the combined red narrow vertical sync component; (h) converting the narrow vertical sync component into the vertical sync component; (i) extracting the narrow horizontal sync component from the combined green narrow horizontal sync component without removing the narrow horizontal sync component from the combined green narrow horizontal sync component; (j) converting the narrow horizontal sync component into the horizontal sync component; (k) receiving the computer video signal comprising the combined red narrow vertical sync, combined green narrow horizontal sync, blue, vertical sync and horizontal sync components.
2. A method as in claim 1 , wherein the narrow vertical sync component and the narrow horizontal sync component having a pulse width ranging from about 1 nanosecond to about 250 nanoseconds.
3. A method as in claim 1 , wherein the narrow vertical sync component and the narrow horizontal sync component having a pulse width ranging from about 20 nanoseconds to about 60 nanoseconds.
4. A method as in claim 1 , wherein the narrow vertical sync component having a pulse width of about 20 nanoseconds and the narrow horizontal sync having a pulse width of about 20 nanoseconds.
5. A method of encoding and decoding computer video signals for transmission over a twisted pair cable, comprising the steps of: (l) providing a computer video signal comprising red, green, blue, vertical sync and horizontal sync components; (m) converting the horizontal sync component into a narrow horizontal sync component; (n) converting the vertical sync component into a narrow vertical sync component having a pulse width different from that of the narrow horizontal sync component; (o) combining the narrow horizontal sync component with the narrow vertical sync component thereby generating a combined narrow horizontal sync narrow vertical sync component; ( p) combining the combined narrow horizontal sync narrow vertical sync component with the green component thereby generating a combined green narrow horizontal sync narrow vertical sync component; (q) transmitting the red, combined green narrow horizontal sync narrow vertical sync and blue components via a twisted pair cable such that one pair of conductors is used for transmission of each of the components, thereby utilizing only three pairs of conductors; (r) extracting the combined narrow horizontal sync narrow vertical sync component from the combined green narrow horizontal sync narrow vertical sync component without removing the combined narrow horizontal sync narrow vertical sync component from the combined green narrow horizontal sync narrow vertical sync component; (s) separating the narrow horizontal sync component from the narrow vertical sync component; (t) converting the narrow horizontal sync component into the horizontal sync component; (u) converting the narrow vertical sync component into the vertical sync component; (v) receiving the computer video signal comprising the red, combined green narrow horizontal sync narrow vertical sync, horizontal sync, vertical sync and blue components.
6. A method as in claim 5 , wherein the narrow vertical sync component and the narrow horizontal sync component having a pulse width ranging from about 1 nanosecond to about 250 nanoseconds.
7. A method as in claim 5 , wherein the narrow vertical sync component and the narrow horizontal sync component having a pulse width ranging from about 20 nanoseconds to about 60 nanoseconds.
8. A method as in claim 5 , wherein the narrow vertical sync component having a pulse width of about 60 nanoseconds and the narrow horizontal sync having a pulse width of about 20 nanoseconds.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 12, 2003
June 20, 2006
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